J. P. Kennedy, Colm Fitzpatrick, M. Coughlan, M. Yeung, B. Dromey
A major challenge facing the study of radiation in matter on ultrafast time scales is the need for an absolute timing reference. Typically, these type of experiments are performed using pulses of ions from radio frequency accelerators which have nanosecond scale pulse durations and timing jitter making high temporal resolution measurements difficult to achieve. Here, we show that a combination of a highly synchronised probe pulse with a muti-species laser-driven radiation source can allow for the absolute timing of radiation in matter. This is primarily due to the generation of a X-ray calibration fiducial enabling the study of ion-induced dynamics in matter on ultrafast timescales.
{"title":"Absolute timing of laser-driven radiation sources interacting in matter","authors":"J. P. Kennedy, Colm Fitzpatrick, M. Coughlan, M. Yeung, B. Dromey","doi":"10.1117/12.2665624","DOIUrl":"https://doi.org/10.1117/12.2665624","url":null,"abstract":"A major challenge facing the study of radiation in matter on ultrafast time scales is the need for an absolute timing reference. Typically, these type of experiments are performed using pulses of ions from radio frequency accelerators which have nanosecond scale pulse durations and timing jitter making high temporal resolution measurements difficult to achieve. Here, we show that a combination of a highly synchronised probe pulse with a muti-species laser-driven radiation source can allow for the absolute timing of radiation in matter. This is primarily due to the generation of a X-ray calibration fiducial enabling the study of ion-induced dynamics in matter on ultrafast timescales.","PeriodicalId":376481,"journal":{"name":"Optics + Optoelectronics","volume":"06 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129450633","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
F. Loffredo, Anna De Girolamo Del Mauro, F. Villani, M. F. Caso, T. Fasolino, R. Miscioscia, A. Vestri, D. Sagnelli, Amalia D'Avino, L. Petti, G. Nenna
Films based on a composite of a liquid crystal polymer (LC-POL) with acrylic backbone and carbon black (CB) were manufactured and characterized to develop a new smart material able to move under light. In detail, the effect of 0.1wt% of CB, a high absorption and thermal conductive filler, on morphological, optical and photomobile properties was investigated and compared with pristine LC-POL films. To study photomobile behaviuor the films were irradiated with 457nm-laser at different powers and the responses to these stimuli were compared in terms of bending angle and response time. The work shows that the presence of CB induces photomobile properties in an inactive LC polymer matrix and the mechanical response under light is fast and reversible.
{"title":"Photomobile films based on liquid crystal polymer-carbon black composites","authors":"F. Loffredo, Anna De Girolamo Del Mauro, F. Villani, M. F. Caso, T. Fasolino, R. Miscioscia, A. Vestri, D. Sagnelli, Amalia D'Avino, L. Petti, G. Nenna","doi":"10.1117/12.2673120","DOIUrl":"https://doi.org/10.1117/12.2673120","url":null,"abstract":"Films based on a composite of a liquid crystal polymer (LC-POL) with acrylic backbone and carbon black (CB) were manufactured and characterized to develop a new smart material able to move under light. In detail, the effect of 0.1wt% of CB, a high absorption and thermal conductive filler, on morphological, optical and photomobile properties was investigated and compared with pristine LC-POL films. To study photomobile behaviuor the films were irradiated with 457nm-laser at different powers and the responses to these stimuli were compared in terms of bending angle and response time. The work shows that the presence of CB induces photomobile properties in an inactive LC polymer matrix and the mechanical response under light is fast and reversible.","PeriodicalId":376481,"journal":{"name":"Optics + Optoelectronics","volume":"417 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122724751","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The effect of picosecond ramp of ultrashort laser pulse is investigated with the help of particle-in-cell simulations. It is shown that the ramp changes cutoff energies and numbers of ions accelerated from laser-irradiated target depending on laser pulse intensity. It can also substantially change the interaction of the main high-intensity part of the pulse with thin membrane used as a plasma shutter to shape laser pulse temporal profile.
{"title":"Picosecond ramp of ultrashort laser pulse: its effect on laser-driven ion acceleration or plasma shutter","authors":"J. Psikal","doi":"10.1117/12.2665514","DOIUrl":"https://doi.org/10.1117/12.2665514","url":null,"abstract":"The effect of picosecond ramp of ultrashort laser pulse is investigated with the help of particle-in-cell simulations. It is shown that the ramp changes cutoff energies and numbers of ions accelerated from laser-irradiated target depending on laser pulse intensity. It can also substantially change the interaction of the main high-intensity part of the pulse with thin membrane used as a plasma shutter to shape laser pulse temporal profile.","PeriodicalId":376481,"journal":{"name":"Optics + Optoelectronics","volume":"2 10","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120844708","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In the present research work, a Dy3+ doped Tungstate phosphor that emits light in white region has been synthesized using conventional solid-state reaction. An X-ray diffraction (XRD) pattern for the as-synthesized phosphor material was recorded for structural analysis and phase identification. The diffraction peaks of the tungstate phosphor match very well with the standard JCPDS pattern. The optical band gap value of the as-synthesized phosphor has been measured using diffuse reflectance spectra (DRS). The photoluminescence (PL) spectral features recorded for the Dy3+ ions activated tungstate phosphor under 360 nm excitation reveal strong emission peaks in blue (490 nm), a relatively less intense peak in the yellow region (580 nm) and a significantly less intense red peak (683 nm). From the recorded PL spectra, the CIE chromaticity coordinates (0.33046, 0.37422) estimated for 1.0 mol% doping concentration of Dy3+ ions in the as-prepared phosphor material are falling in the white region. CCT value (5580K) signifies its application for cool white light-emitting diode (w-LEDs). The PL decay spectral profile recorded at 480 nm emission under 360 nm excitation shows double exponential behaviour. The temperature-dependent PL (TDPL) measurements demonstrate relatively better thermal stability for the as-synthesized phosphor. All the investigations carried out finally allow us to contemplate the suitability of Dy3+ ions doped tungstate phosphor for w-LED.
{"title":"Structural and luminescent properties of dysprosium ions-doped tungstate phosphor for w-LEDs","authors":"Anu ., Nisha Deopa, A. Rao","doi":"10.1117/12.2669275","DOIUrl":"https://doi.org/10.1117/12.2669275","url":null,"abstract":"In the present research work, a Dy3+ doped Tungstate phosphor that emits light in white region has been synthesized using conventional solid-state reaction. An X-ray diffraction (XRD) pattern for the as-synthesized phosphor material was recorded for structural analysis and phase identification. The diffraction peaks of the tungstate phosphor match very well with the standard JCPDS pattern. The optical band gap value of the as-synthesized phosphor has been measured using diffuse reflectance spectra (DRS). The photoluminescence (PL) spectral features recorded for the Dy3+ ions activated tungstate phosphor under 360 nm excitation reveal strong emission peaks in blue (490 nm), a relatively less intense peak in the yellow region (580 nm) and a significantly less intense red peak (683 nm). From the recorded PL spectra, the CIE chromaticity coordinates (0.33046, 0.37422) estimated for 1.0 mol% doping concentration of Dy3+ ions in the as-prepared phosphor material are falling in the white region. CCT value (5580K) signifies its application for cool white light-emitting diode (w-LEDs). The PL decay spectral profile recorded at 480 nm emission under 360 nm excitation shows double exponential behaviour. The temperature-dependent PL (TDPL) measurements demonstrate relatively better thermal stability for the as-synthesized phosphor. All the investigations carried out finally allow us to contemplate the suitability of Dy3+ ions doped tungstate phosphor for w-LED.","PeriodicalId":376481,"journal":{"name":"Optics + Optoelectronics","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116755230","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
L. Gulyás Oldal, T. Csizmadia, Z. Filus, T. Grósz, M. De Marco, P. Jójárt, I. Seres, Z. Bengery, B. Gilicze, K. Varjú, S. Kahaly, B. Major
The High-Repetition-rate laser-driven Gas-based High-order Harmonic Generation (HR GHHG) beamlines of the Extreme Light Infrastructure Attosecond Light Pulse Source (ELI ALPS) have started their operation in the recent years. Both beamlines, one designed for gas-phase targets – the HR GHHG Gas beamline –, and one for condensed-phase samples – the HR GHHG Condensed beamline –, now provide high-flux, extreme ultraviolet (XUV) radiation with pump-probe capabilities at 100 kHz repetition rate. The HR GHHG Cond beamline is equipped with a time-compensated XUV monochromator, allowing for tuning the spectral properties while maintaining short, close to Fourier-limited pulse duration in the femtosecond regime. Cutting-edge experimental end stations are also available, for example a Reaction Microscope and a NanoESCA device. Both beamlines are past their first commissioning user experiments. In this presentation the capabilities along with some recent developments and latest experiments will be presented for these two unique attosecond sources.
{"title":"Recent experiments and advances at the high-repetition-rate attosecond beamlines of ELI ALPS","authors":"L. Gulyás Oldal, T. Csizmadia, Z. Filus, T. Grósz, M. De Marco, P. Jójárt, I. Seres, Z. Bengery, B. Gilicze, K. Varjú, S. Kahaly, B. Major","doi":"10.1117/12.2664845","DOIUrl":"https://doi.org/10.1117/12.2664845","url":null,"abstract":"The High-Repetition-rate laser-driven Gas-based High-order Harmonic Generation (HR GHHG) beamlines of the Extreme Light Infrastructure Attosecond Light Pulse Source (ELI ALPS) have started their operation in the recent years. Both beamlines, one designed for gas-phase targets – the HR GHHG Gas beamline –, and one for condensed-phase samples – the HR GHHG Condensed beamline –, now provide high-flux, extreme ultraviolet (XUV) radiation with pump-probe capabilities at 100 kHz repetition rate. The HR GHHG Cond beamline is equipped with a time-compensated XUV monochromator, allowing for tuning the spectral properties while maintaining short, close to Fourier-limited pulse duration in the femtosecond regime. Cutting-edge experimental end stations are also available, for example a Reaction Microscope and a NanoESCA device. Both beamlines are past their first commissioning user experiments. In this presentation the capabilities along with some recent developments and latest experiments will be presented for these two unique attosecond sources.","PeriodicalId":376481,"journal":{"name":"Optics + Optoelectronics","volume":"12582 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131158569","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
E. Vishnyakov, A. Sagisaka, K. Ogura, T. Pikuz, C. Armstrong, S. Pikuz, B. González-Izquierdo, T. Esirkepov, Wenchao Yan, T. Jeong, Sushil Singh, P. Hadjisolomou, O. Finke, G. Grittani, M. Nevrkla, C. Lazzarini, A. Velyhan, T. Hayakawa, Y. Fukuda, J. Koga, M. Ishino, Kotaro Kondo, Y. Miyasaka, A. Kon, M. Nishikino, E. V. Nosach, D. Khikhlukha, I. Tsygvintsev, D. Kumar, J. Nejdl, D. Margarone, P. Sasorov, M. Kando, H. Kiriyama, G. Korn, K. Kondo, S. V. Bulanov, T. Kawachi, A. Pirozhkov
We review a number of instruments employed in a high-intensity J-KAREN-P laser-solid interaction experiment and discuss the applicability of the diagnostics to the best target position determination with a ~10 μm accuracy, while the focal spot size was ~1 μm and peak intensity was up to 7×1021 W/cm2. We discuss both front- and back-side diagnostics, some of them operated in the infrared, visible and ultraviolet ranges, while others in the extreme ultraviolet, soft X-ray and gamma-ray ranges. We found that the applicability of some of the instruments to the best at-focus target position determination depends on the thickness of the target.
{"title":"Instruments for best target position determination in the high-intensity laser-solid interaction experiment","authors":"E. Vishnyakov, A. Sagisaka, K. Ogura, T. Pikuz, C. Armstrong, S. Pikuz, B. González-Izquierdo, T. Esirkepov, Wenchao Yan, T. Jeong, Sushil Singh, P. Hadjisolomou, O. Finke, G. Grittani, M. Nevrkla, C. Lazzarini, A. Velyhan, T. Hayakawa, Y. Fukuda, J. Koga, M. Ishino, Kotaro Kondo, Y. Miyasaka, A. Kon, M. Nishikino, E. V. Nosach, D. Khikhlukha, I. Tsygvintsev, D. Kumar, J. Nejdl, D. Margarone, P. Sasorov, M. Kando, H. Kiriyama, G. Korn, K. Kondo, S. V. Bulanov, T. Kawachi, A. Pirozhkov","doi":"10.1117/12.2665527","DOIUrl":"https://doi.org/10.1117/12.2665527","url":null,"abstract":"We review a number of instruments employed in a high-intensity J-KAREN-P laser-solid interaction experiment and discuss the applicability of the diagnostics to the best target position determination with a ~10 μm accuracy, while the focal spot size was ~1 μm and peak intensity was up to 7×1021 W/cm2. We discuss both front- and back-side diagnostics, some of them operated in the infrared, visible and ultraviolet ranges, while others in the extreme ultraviolet, soft X-ray and gamma-ray ranges. We found that the applicability of some of the instruments to the best at-focus target position determination depends on the thickness of the target.","PeriodicalId":376481,"journal":{"name":"Optics + Optoelectronics","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132103981","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
D. Stutman, N. Safca, P. Tomassini, E. Anghel, C. A. Ur
Phase contrast X-ray imaging can be much more sensitive to soft tissue lesions than conventional absorption contrast X-ray imaging, being a potential game changer for medical imaging. A phase contrast method well suited for clinical implementation is the grating interferometry. We show that by using μm period multi-meter long interferometers one can strongly increase the phase sensitivity and lower the dose towards soft tissue imaging applications such mammography. Conventional X-ray tubes do not provide, however, sufficient X-ray flux for clinical imaging with such long interferometers. Instead, 100-TW class lasers could produce highly directional and intense X-ray sources ideal for high sensitivity medical interferometry. We present the X-ray source characteristics required for clinical interferometry, advantages and disadvantages of betatron versus inverse Compton scattering sources for clinical application, and some practical considerations towards laser based interferometric medical imaging.
{"title":"Towards high-sensitivity and low-dose medical imaging with laser x-ray sources","authors":"D. Stutman, N. Safca, P. Tomassini, E. Anghel, C. A. Ur","doi":"10.1117/12.2664833","DOIUrl":"https://doi.org/10.1117/12.2664833","url":null,"abstract":"Phase contrast X-ray imaging can be much more sensitive to soft tissue lesions than conventional absorption contrast X-ray imaging, being a potential game changer for medical imaging. A phase contrast method well suited for clinical implementation is the grating interferometry. We show that by using μm period multi-meter long interferometers one can strongly increase the phase sensitivity and lower the dose towards soft tissue imaging applications such mammography. Conventional X-ray tubes do not provide, however, sufficient X-ray flux for clinical imaging with such long interferometers. Instead, 100-TW class lasers could produce highly directional and intense X-ray sources ideal for high sensitivity medical interferometry. We present the X-ray source characteristics required for clinical interferometry, advantages and disadvantages of betatron versus inverse Compton scattering sources for clinical application, and some practical considerations towards laser based interferometric medical imaging.","PeriodicalId":376481,"journal":{"name":"Optics + Optoelectronics","volume":"77 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127204492","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
I. Klačková, J. Sztuk-Dambietz, H. Graafsma, S. M. Hosseini-Saber, A. Klyuev, T. Laurus, O. Meyer, T. Preston, N. Raab, R. Shayduk, M. Sikorski, S. Stern, C. Strohm, U. Trunk, M. Turcato
The European X-ray Free Electron Laser (EuXFEL) began its user operation five years ago, opening and offering new research possibilities. The facility delivers high brilliance, ultra-short, spatially coherent x-ray pulses with a high repetition rate to six instruments (FXE, SPB/SFX, MID, HED, SCS and SQS) by means of three different beamlines (SASE 1, SASE 2 and SASE 3). One of the first detectors used for early-stage experiments was the Adaptive Gain Integrating Pixel Detector (AGIPD), custom designed to meet the challenging needs of scientific instruments. The AGIPD is a megahertz-rate integrating hybrid megapixel camera with a per-pixel adaptive gain amplification, allowing the integration of up to 104 of 12 keV photons per pixel in its low gain stage. Currently, three scientific instruments, namely SPB/SFX, MID and HED employ the AGIPD systems, the latter mentioned using a prototype, half-megapixel camera with an upgraded version of readout ASICs. The AGIPDs at EuXFEL are successfully used for experimental techniques like serial femtosecond crystallography, MHz single particle imaging, MHz x-ray photon correlation spectroscopy or MHz diffraction of materials under high pressures in a diamond anvil cell. Since September 2017, the AGIPD is continuously used and has become an established detector technology, with further advancements and developments planned. Delivering quality experimental data requires reliable and reproducible detector characterisation and calibration that have to be performed regularly with a continuous improvement of correction methods in close collaboration with scientific instruments. This work summarises five years of experience operating the AGIPD detectors at the EuXFEL scientific instruments. It gives an overview of scientific capabilities and examples of successful studies performed with AGIPD detectors. Moreover, challenges concerning detector calibration and characterisation are presented.
{"title":"Five years operation experience with the AGIPD detectors at the European XFEL","authors":"I. Klačková, J. Sztuk-Dambietz, H. Graafsma, S. M. Hosseini-Saber, A. Klyuev, T. Laurus, O. Meyer, T. Preston, N. Raab, R. Shayduk, M. Sikorski, S. Stern, C. Strohm, U. Trunk, M. Turcato","doi":"10.1117/12.2666402","DOIUrl":"https://doi.org/10.1117/12.2666402","url":null,"abstract":"The European X-ray Free Electron Laser (EuXFEL) began its user operation five years ago, opening and offering new research possibilities. The facility delivers high brilliance, ultra-short, spatially coherent x-ray pulses with a high repetition rate to six instruments (FXE, SPB/SFX, MID, HED, SCS and SQS) by means of three different beamlines (SASE 1, SASE 2 and SASE 3). One of the first detectors used for early-stage experiments was the Adaptive Gain Integrating Pixel Detector (AGIPD), custom designed to meet the challenging needs of scientific instruments. The AGIPD is a megahertz-rate integrating hybrid megapixel camera with a per-pixel adaptive gain amplification, allowing the integration of up to 104 of 12 keV photons per pixel in its low gain stage. Currently, three scientific instruments, namely SPB/SFX, MID and HED employ the AGIPD systems, the latter mentioned using a prototype, half-megapixel camera with an upgraded version of readout ASICs. The AGIPDs at EuXFEL are successfully used for experimental techniques like serial femtosecond crystallography, MHz single particle imaging, MHz x-ray photon correlation spectroscopy or MHz diffraction of materials under high pressures in a diamond anvil cell. Since September 2017, the AGIPD is continuously used and has become an established detector technology, with further advancements and developments planned. Delivering quality experimental data requires reliable and reproducible detector characterisation and calibration that have to be performed regularly with a continuous improvement of correction methods in close collaboration with scientific instruments. This work summarises five years of experience operating the AGIPD detectors at the EuXFEL scientific instruments. It gives an overview of scientific capabilities and examples of successful studies performed with AGIPD detectors. Moreover, challenges concerning detector calibration and characterisation are presented.","PeriodicalId":376481,"journal":{"name":"Optics + Optoelectronics","volume":"2015 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114608739","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Gabriele Zeni, F. Frassetto, A. Vanzo, S. Bonora, L. Poletto
Broadband light monochromatization in the extreme ultraviolet requires typically the use of diffraction gratings at grazing incidence, where the grating is rotated and eventually translated to perform the wavelength scanning. Several configurations have been proposed, using plane or concave gratings with uniform or variable line spacing. We propose here a low-cost experimental setup in which a thin plane diffraction grating is bended to an almost cylindrical shape to perform at the same time the spectral selection and the focalization of the selected spectral component. In such a way, the number of optical elements needed to realize the monochromator is reduced to two: the grating and the focusing mirror. A bendable grating has been tested in the 13-50 eV region, very good focal properties have been measured with very low residual aberrations. Furthermore, the shape of the bended surface has been measured using a wavefront sensor in order to confirm the effectiveness of the bending technique. The proposed solution can be used to achieve monochromatization both in large-scale facilities such as FELs or synchrotrons, but also in table-top setups, such as those exploiting high-order harmonic generation, that are often used for the preparatory phase of experiments to be later performed at FEL facilities.
{"title":"Bendable grating for monochromatization in the extreme-ultraviolet","authors":"Gabriele Zeni, F. Frassetto, A. Vanzo, S. Bonora, L. Poletto","doi":"10.1117/12.2665625","DOIUrl":"https://doi.org/10.1117/12.2665625","url":null,"abstract":"Broadband light monochromatization in the extreme ultraviolet requires typically the use of diffraction gratings at grazing incidence, where the grating is rotated and eventually translated to perform the wavelength scanning. Several configurations have been proposed, using plane or concave gratings with uniform or variable line spacing. We propose here a low-cost experimental setup in which a thin plane diffraction grating is bended to an almost cylindrical shape to perform at the same time the spectral selection and the focalization of the selected spectral component. In such a way, the number of optical elements needed to realize the monochromator is reduced to two: the grating and the focusing mirror. A bendable grating has been tested in the 13-50 eV region, very good focal properties have been measured with very low residual aberrations. Furthermore, the shape of the bended surface has been measured using a wavefront sensor in order to confirm the effectiveness of the bending technique. The proposed solution can be used to achieve monochromatization both in large-scale facilities such as FELs or synchrotrons, but also in table-top setups, such as those exploiting high-order harmonic generation, that are often used for the preparatory phase of experiments to be later performed at FEL facilities.","PeriodicalId":376481,"journal":{"name":"Optics + Optoelectronics","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130524650","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Veronika Kratzer, L. Geulig, Erin Grace Fitzpatrick, F. Lindner, Vitus Magin, Maximilian Julius Weiser, P. Thirolf
Target pre-heating has proven to be beneficial for laser-driven heavy-ion acceleration. As it allows to remove omnipresent carbohydrate surface contaminants, heating can affect the cutoff energy and increase the efficient acceleration of heavy ions as, e.g., required for the novel fission-fusion nuclear reaction scheme where kinetic energies of fissile species around 7 MeV/u are targeted. At the Centre for Advanced Laser Applications in Garching we use a 3W Nd:YAG cw laser to heat the (in our case gold) target foil in order to investigate the dependency of efficient gold ion acceleration on heating parameters. For real-time assessment of the surface temperature the thermal spectrum is measured with a NIR spectrometer to which Planck’s law is fitted.
{"title":"Spectroscopic real-time temperature diagnostic for laser-heated thin gold foils","authors":"Veronika Kratzer, L. Geulig, Erin Grace Fitzpatrick, F. Lindner, Vitus Magin, Maximilian Julius Weiser, P. Thirolf","doi":"10.1117/12.2665472","DOIUrl":"https://doi.org/10.1117/12.2665472","url":null,"abstract":"Target pre-heating has proven to be beneficial for laser-driven heavy-ion acceleration. As it allows to remove omnipresent carbohydrate surface contaminants, heating can affect the cutoff energy and increase the efficient acceleration of heavy ions as, e.g., required for the novel fission-fusion nuclear reaction scheme where kinetic energies of fissile species around 7 MeV/u are targeted. At the Centre for Advanced Laser Applications in Garching we use a 3W Nd:YAG cw laser to heat the (in our case gold) target foil in order to investigate the dependency of efficient gold ion acceleration on heating parameters. For real-time assessment of the surface temperature the thermal spectrum is measured with a NIR spectrometer to which Planck’s law is fitted.","PeriodicalId":376481,"journal":{"name":"Optics + Optoelectronics","volume":"458 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124332198","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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